[PATCH] vdso.7: document vDSO for RISCV

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Document the symbols exported by the RISCV vDSO which is present
from kernel 4.15 onwards.

See https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/arch/riscv/vdso

Signed-off-by: Tobias Klauser <tklauser@xxxxxxxxxx>
---
 man7/vdso.7 | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/man7/vdso.7 b/man7/vdso.7
index 8375df527ffa..8ac6c12d2c2f 100644
--- a/man7/vdso.7
+++ b/man7/vdso.7
@@ -153,6 +153,7 @@ ia64	linux\-gate.so.1
 mips	linux\-vdso.so.1
 ppc/32	linux\-vdso32.so.1
 ppc/64	linux\-vdso64.so.1
+riscv	linux\-vdso.so.1
 s390	linux\-vdso32.so.1
 s390x	linux\-vdso64.so.1
 sh	linux\-gate.so.1
@@ -433,6 +434,27 @@ and
 .I __kernel_clock_gettime
 interfaces;
 the kernel falls back to the real system call.
+.SS riscv functions
+.\" See linux/arch/riscv/kernel/vdso/vdso.lds.S
+The table below lists the symbols exported by the vDSO.
+.if t \{\
+.ft CW
+\}
+.TS
+l l.
+symbol	version
+_
+__kernel_rt_sigreturn	LINUX_4.15
+__kernel_gettimeofday	LINUX_4.15
+__kernel_clock_gettime	LINUX_4.15
+__kernel_clock_getres	LINUX_4.15
+__kernel_getcpu	LINUX_4.15
+__kernel_flush_icache	LINUX_4.15
+.TE
+.if t \{\
+.in
+.ft P
+\}
 .SS s390 functions
 .\" See linux/arch/s390/kernel/vdso32/vdso32.lds.S
 The table below lists the symbols exported by the vDSO.
-- 
2.20.0




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